People greet 17 medics supporting virus-hit Hubei Province as they come back to work at the Second Affiliated Hospital of University of South China in Hengyang, central China's Hunan Province, April 5, 2020. These medics returned to their positions on Sunday after undergoing quarantine and rest. (Photo by Cao Zhengping/Xinhua)

People greet 17 medics supporting virus-hit Hubei Province as they come back to work at the Second Affiliated Hospital of University of South China in Hengyang, central China's Hunan Province, April 5, 2020. These medics returned to their positions on Sunday after undergoing quarantine and rest. (Photo by Cao Zhengping/Xinhua)

A medic welcomes and hugs her colleague who has supported virus-hit Hubei Province and has come back to work at the Second Affiliated Hospital of University of South China after undergoing quarantine at a designated hotel in Hengyang, central China's Hunan Province, April 5, 2020. These medics returned to their positions on Sunday after undergoing quarantine and rest. (Photo by Cao Zhengping/Xinhua)

Medics supporting virus-hit Hubei Province take the bus heading for the Second Affiliated Hospital of University of South China as they come back to work after undergoing quarantine at a designated hotel in Hengyang, central China's Hunan Province, April 5, 2020. These medics returned to their positions on Sunday after undergoing quarantine and rest. (Photo by Cao Zhengping/Xinhua)